The most common and most likely answer to this crossword clue is the 5 letter word CHEST
I've seen this crossword clue in The Guardian
C
H
E
S
T
More clues leading to the result CHEST
Buddy explains!

The straight part
We know that "case" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case case = chest.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CHEST mean?
CHEST noun- A box, now usually a large strong box with a secure convex lid.
- A coffin.
- The place in which public money is kept; a treasury.
- A chest of drawers.
- The portion of the front of the human body from the base of the neck to the top of the abdomen; the thorax. Also the analogous area in other animals.
- A hit or blow made with one's chest.
- To hit with one's chest (front of one's body)
- To deposit in a chest.
- To place in a coffin.
- Debate; quarrel; strife; enmity.